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복숭아 재배기간 중 살균제 Fenarimol과 살충제 Flufenoxuron의 생산단계 잔류허용기준 설정
문혜리 ( Hye Ree Moon ),박재훈 ( Jae Hoon Park ),윤지영 ( Ji Yeong Yoon ),나은식 ( Eun Shik Na ),이규승 ( Kyu Seung Lee ) 한국환경농학회 2013 한국환경농학회지 Vol.32 No.2
BACKGROUND: This study was performed to establishment the PHRLs of peach during cultivation period, and also to estimate biological half-lives for residues of fenarimol and flufenoxuron. METHODS AND RESULTS: The extracted samples of fenarimol were analyzed by GC-ECD and the flufenoxuron extracted samples were analyzed by HPLC-DAD. Recoveries of fenarimol at two fortification levels of 0.1 mg/kg, 0.5 mg/kg were 93.69±6.56 (%) and 94.45±1.60 (%), respectively. And recoveries of flufenoxuron at two fortification levels of 0.1 mg/kg, 0.5 mg/kg were 106.73±5.90 (%) and 96.37±6.66 (%), respectively. CONCLUSION(S): The biological half-lives of fenarimol in single treatment and triple treatment were 3.5day and 3.8day. thatof Flufenoxuron was also 7.1day and 4.9day, respectively. The PHRL of fenarimol were recommended as 1.5 mg/kg for 10day before harvest and the PHRL of flufenoxuron were recommended as 1.4 mg/kg for 10day before harvest.
액-액 분배법을 활용한 작물 중 pymetrozine의 잔류분석법 확립
윤지영(Ji-Young Yoon),문혜리(Hye-ree Moon),박재훈(Jae-hun Park),한예훈(Ye-hoon Han),이규승(Kyu-Seung Lee) 한국농약과학회 2013 농약과학회지 Vol.17 No.2
Polar pesticides like pymetrozine (log P<sub>ow</sub>: -0.18) are known to be difficult to analyze. The analytical method of pymetrozine using hydromatrix included in the official method of KFDA was uncommon and provided ambiguous evidence to confirm both the identity and the quantity. Therefore, precise single residue analytical method was developed in representative crops for using liquid-liquid extraction (LLE). The pymetrozine residue was extracted with methanol from 11 representative crops which comprised apple, blueberry, broccoli, cabbage, cherry, crown daisy, hulled rice, Korean cabbage, potato, rice and watermelon. The extract was purified serially by liquid-liquid extraction (LLE) and silica solid phase extraction (SPE). For rice and hulled rice samples, n-hexane partition was additionally adopted to remove nonpolar interferences, mainly lipids. The residue levels were analyzed by HPLC with DAD, using C<sub>8</sub> column. LOQ (limit of quantitation) of pymetroizinie was 1 ng (S/N > 10) and MQL (method quantitation limit) was 0.01 mg/kg. Mean recoveries from 11 crop samples fortified at three levels (MQL, 10 × MQL and 50 × MQL) in triplicate were in the range of 83.1~98.5% with coefficients of variation (CV) of less than 10%, regardless of sample type, which satisfies the criteria of KFDA. The method established in this study could be applied to most of crops as an official and general method for analysis of pymetrozine residue.
구두 발표 : 구두발표(OC) - 농업화학 및 생태,식품분야 ; 유기물 함량에 따른 밭 토양 중 Hexaconazole의 분해특성
박재훈 ( Jae Hun Park ),윤지영 ( Ji Yeong Yoon ),문혜리 ( Hye Ree Moon ),이규승 ( Kyu Seung Lee ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
Hexaconazole은 높은 항균활성과 상대적으로 낮은 저항성 위험을 가지고 있어 전 세계적으로 널리 쓰이고 있으며, 국내에서는 토양에 처리하는 양파, 마늘을 비롯하여 감부터 포도에 이르기까지 총 31작물에 17가지의 농약이 등록되어 있을 정도로 적용범위가 넓다. 살포된 농약성분의 99% 이상은 비표적대상인 토양, 대기 및 작물체 등에 분포하게 되며, 이 중 토양표면에 살포된 농약성분은 환경위해성 관점에서는 매우 중요한 연구 과제라 볼 수 있다. 따라서 토성이 다른 두 지역의 토양을 이용하여 실내와 실외시험으로 구분, 수행하여 경시적인 잔류량을 비교하였으며, 농약이 토 양에 유입되었을 때 분해속도와 관련이 있는 여러 요인 중 하나인 유기물함량이 토양에서의 분해 및 반감기에 얼마나 영향을 미치는 지를 알아보고자 하였다. 실험은 밭토양 중 hexaconzole의 잔류량 변화실험(실험 1)을 바탕으로 humic acid (humic acid sodium salt) 처리량에 따른 초기 잔류 량 비교실험(실험 2)과 sea sand에 humic acid의 처리에 따른 추출불가분획(non extractable fraction) 비교실험(실험 3)으로 크게 나눠 수행하였다. 그 결과, 실험 1과 2를 통해 포장실험과 실 내실험에서의 밭 토양 중 hexaconazole의 잔류량 변화를 비교하여, 유기물 함량이 많은 토양에서 반감기가 더 길게 나타나, 포장실험과 실내실험에서의 밭 토양 중 hexaconazole의 반감기에 영향을 미치는 요인이 유기물 함량이라는 것을 추정할 수 있었다. 따라서 밭 토양 내 약제의 분해가 미생물에 의한 것인지 유기물과 약제간의 상관관계 때문인지를 확인하기 위해, 수분조건과 토양을 배제한 상태에서 humic acid의 양에 차이를 두었을 때의 경시적 잔류량 변화를 알아보기 위해 실 험 3을 수행하였고, 그 결과 유기물함량에 따라 추출불가분획이 증가한다는 것을 확인할 수 있었다. 따라서 본 연구에 사용한 토양 중 유기물함량과 양이온치환용량이 상대적으로 높은 토양에서 약제가 유기물과의 흡착을 형성하여 토양 내 잔류기간이 길어졌고, 토양미생물의 영향 또한 함께 받아, 이로 인해 반감기가 길어진 것으로 생각된다.
복숭아의 재배기간 중 살충제 Clothianidin 및 살균제 Fluquinconazole의 생산단계 농약잔류허용기준의 설정
박재훈 ( Jae Hun Park ),임종성 ( Jong Sung Lim ),윤지영 ( Ji Yeong Yoon ),문혜리 ( Hye Ree Moon ),한예훈 ( Ye Hoon Han ),이용재 ( Yong Jae Lee ),이규승 ( Kyu Seung Lee ) 한국환경농학회 2012 한국환경농학회지 Vol.31 No.3
BACKGROUND: It is hard to control the agricultural products exceeding MRL (maximum residue limit) before forwarding. Therefore, NAQS (National Agricultural Products Quality Management Service, South Korea) established PHRL (pre-harvest residue limit) on agricultural products during their cultivation periods. This study was performed to set the PHRLs of peach during cultivation period, and also to estimate biological half-lives for residues of clothianidin and fluquinconazole. METHODS AND RESULTS: Two groups of peach were treated under Korean GAP (Good Agricultural Practices) with application time, single and triple treatments. Sample was collected over 14days (each after 0, 2, 4, 6, 8, 10, 12, 14 days. 8times), and clothianidin and fluquinconazole were analyzed by HPLC/DAD and GC/ECD, respectively. CONCLUSION: The biological half-life of clothianidin in single treatment and triple treatment was 5.2days and 7.0days. That of fluquinconazole was also 3.9days and 4.1days, respectively. The PHRL of peach on 10days before harvest was 1.4 mg/kg in clothianidin and 1.8 mg/kg in fluquinconazole.
풍속 및 수중확산에 따른 방역용 Deltamethrin의 수중 잔류변화
조경원(Kyung-Won Cho),박재훈(Jae-Hun Pak),임종성(Ji-Yeong Yoon),윤지영(Hye-Ree Moon),문혜리(Jong-Sung Lim),이용주(Yong-Ju Lee),이성규(Sung-Kyu Lee),이규승(Kyu-Seung Lee) 한국농약과학회 2013 농약과학회지 Vol.17 No.2
The objectives of this study were to provide the basic data of the residue of deltamethrin in the stream water. Deltamethrin was treated on side of Ban-Suk stream and Juk-Dong ditch for hygienic purpose by air spray. The drift concentration of deltamethrin was investigated with different wind speed condition on Ban-Suk stream (A), and the change of residue with time course on Juck-dong ford (B). Also we found the residual change of deltamethrin until 48 hour in Yu-Seong stream confluence (C) where two streams join. Maximum residues of A were 0.17 μg/L (5 min, 200 m) at strong wind speed and 4.42 μg/L (0 min, 25 m) at moderate wind speed according to different wind velocity. Residues of B were 0.15~0.26 μg/L (0~480 min) after spraying, and decreased to a non-detected level after 720 min. Residues of C were 0.15 μg/L (0 min), 0.11 μg/L (1 min) and 0.10 μg/L (12 hr) after spraying, and no residues were detected in any other samples. From these results, it is concluded that deltamethrin residues in water should be rapidly diluted into stream water and affected negligible toxic effect to stream ecosystem.
복숭아 중 Methoxyfenozide와 Novaluron의 생산단계 농약잔류허용기준 설정
조경원(Kyung-Won Cho),박재훈(Jae-Hun Park),김지원(Ji-Won Kim),윤지영(Ji-Yeong Yoon),문혜리(Hye-Ree Moon),이규승(Kyu-Seung Lee) 한국농약과학회 2013 농약과학회지 Vol.17 No.1
Methoxyfenozide and novaluron were sprayed with single and triple treatments separately on peach during cultivation period. Samples were collected over 14 days, 8 times in total (0, 2, 4, 6, 8, 10, 12, 14 days). Methoxyfenozide and novaluron were extracted with acetone and partitioned with dichloromethane, and analyzed by HPLC/DAD. Method Quantitation Limit (MQL) were both 0.005 mg/kg, average recoveries of methoxyfenozide at two fortification levels of 0.05 and 0.25 mg/kg were determined 92.7±2.9% and 102.8±3.1%, and novaluron were 98.2±4.8% and 96.7±9.0%, respectively. The biological half-life of methoxyfenozide was about 4.41 days at single treatment, and 4.24 days at triple treatments. The biological half-life of novaluron was about 14.81 days at single treatment, and 14.50 days at triple treatments. Dissipation of pesticides on peach was influenced by growth dilution effect. In case of application of methoxyfenozide and novaluron following guidelines on safe use of pesticides, the final residue level was predicted to be lower than Maximum Residue Limit (MRL).